Comment 35 for bug 1243557

With the Nouveau driver selected, my NVS 4200M/Ubuntu 13.10 system frequently hangs when under heavy graphics load (flightgear usually triggers this within a few minutes) and/or on battery power. This does not happen with the nvidia-319 binary driver.

The mouse pointer continues to move at first, but often freezes later; the keyboard LEDs do not react. Sounds already playing continue until finished, but no new ones start (i.e. applications are frozen). Alt+SysRq works.

The kernel log always has the error
nouveau ![ PFIFO][0000:01:00.0] unhandled status 0x00800000
usually preceded by several instances of the warning
nouveau W[ PFIFO][0000:01:00.0] INTR 0x01000000: 0x00000005
and followed by a wide range of other errors.

This happens with both the default (3.11.0) kernel (Ubuntu bug https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1243557 ) and the latest git kernel, with the default userspace (libdrm-nouveau 2.4.46/xserver-xorg-video-nouveau 1.0.9/mesa 9.2.1); the attached logs are with the latter (crashes at Nov 15 18:05 and 18:42 in the kernel log, the Xorg log is from the second of these).

With the latest git userspace (xorg/proto/dri3proto, mesa/drm, xcb/libxcb, xorg/lib/libxshmfence, mesa/mesa, xorg/proto/presentproto, xcb/proto, nouveau/xf86-video-nouveau), the system hangs on boot (at a correctly displayed graphical splash screen), with Alt+SysRq not working and nothing recognisable as an error in the logs. I suspect this is due to an incompatible combination of Ubuntu and latest-git (the recommended mesa/drm, nouveau/xf86-video-nouveau, mesa/mesa wouldn't compile on its own, as it needs dri3 which isn't in Ubuntu yet).